This package addresses the configuration problem which is propagating configurations that are available at run-time, allowing multiple configurations to coexist without resorting to mutable global variables or System.IO.Unsafe.unsafePerformIO.

That package is an implementation of the ideas presented in the paper "Functional Pearl: Implicit Configurations" by Oleg Kiselyov and Chung-chieh Shan (original paper). However, the API has been streamlined to improve performance.

There are a handful of tutorials on how to use this library:

• Austin Seipp's tutorial Reflecting values to types and back provides a summary of the approach taken by this library, along with more motivating examples.

• Arnaud Spiwack's tutorial All about reflection explains how to use this library.

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Flags

Manual Flags

Name	Description	Default
template-haskell	You can disable the use of the `template-haskell` package using `-f-template-haskell`. Disabling this is an unsupported configuration, but it may be useful for accelerating builds in sandboxes for expert users.	Enabled

Automatic Flags

Name	Description	Default
slow	If you enable this flag, we use a more portable much much slower implementation. Moreover, the Given API is broken, so this is currently an unsupported configuration. If you feel the need to turn on this flag for any reason, please email the maintainer!	Disabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

Downloads

• reflection-2.1.9.tar.gz [browse] (Cabal source package)
• Package description (as included in the package)

Maintainer's Corner

Package maintainers

• EdwardKmett, ryanglscott

For package maintainers and hackage trustees

• edit package information

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